Computes Jaccard distances between the columns of a 0-1-matrix.
Usage
jaccard(regmat)
Arguments
regmat
0-1-matrix. Columns are species, rows are regions.
Value
A symmetrical matrix of Jaccard distances.
Details
The Jaccard distance between two species is 1-(number of regions where
both species are present)/(number of regions where at least one
species is present).
Thank you to Laurent Buffat for improving this function!
data(kykladspecreg)
# Note: If you do not use the installed package, replace this by# kykladspecreg <- read.table("(path/)kykladspecreg.dat")jaccard(t(kykladspecreg))